Jakoben, Darnice, st. Pěťuchovo

Could somebody give some information to the war places Jakoben, Darnice, st. Pěťuchovo? There was captured (Jakoben) my grandfather of 3. p. pl. and later here (Darnice, st. Pěťuchovo) signed up in legions to the unit 2. leh.děl.pl..